DM15L Review

[Steve Simpkin]

(10-17-2024 05:35 PM)Commie Wrote:  Hi,

Very interesting, how does the dm15l compare to the hp15ce?. I bought the latter and it suffers from key bounce, other than that it seems a faithful reproduction of the original.

Cheers
Darren

Have you tried updating the firmware on your HP-15C Collector's Edition? The updated HP-15C CE firmware fixes the HP-16C emulation DEC display bug and increases key debouncing time (to 120ms). Increasing the key debouncing time mostly helps with cases where one key press produces multiple presses for example getting 1223 on the display when pressing 123).

Here is the official announcement. If you look through this long post, you will see several cases where the new firmware fixes the above multiple entry key press issue.
https://www.hpmuseum.org/forum/thread-22...ght=bounce

You will need the USB programming cable to upgrade the firmware.
https://www.thecalculatorstore.com/p/dat...alculators

The USB cable also allows you to use a Windows utility program allows you to backup and restore the memory of your HP-15C CE to a file.